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Share-Based Compensation - Aggregated Information Regarding Stock Options Granted (Detail)	6 Months Ended
	Jul. 31, 2021 $ / shares shares
Share-based Compensation [Abstract]
Beginning balance, Number of Options | shares	622,083
Granted, Number of Options | shares	0
Exercised, Number of Options | shares	(4,425)
Forfeited, Number of Options | shares	(14,015)
Canceled, Number of Options | shares	0
Ending balance, Number of Options | shares	603,643
Beginning balance, Weighted-Average Exercise Price Per Share | $ / shares	$ 14.63
Granted, Weighted-Average Exercise Price Per Share | $ / shares	0
Exercised, Weighted-Average Exercise Price Per Share | $ / shares	9.57
Forfeited, Weighted-Average Exercise Price Per Share | $ / shares	14.96
Cancelled, Weighted-Average Exercise Price Per Share | $ / shares	0
Ending balance, Weighted-Average Exercise Price Per Share | $ / shares	$ 14.66

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(4)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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